|
|
|
| Registros recuperados: 158 | |
|
|
| Hussain, Intizar; Marikar, Fuard; Jehangir, Waqar Ahmed. |
| A study of the enormous differences in agricultural productivity that exist across farms and regions in Pakistan, where, for example, recent farm-level data from Sindh, indicates that irrigated wheat output per hectare varies from 0.5 to 5.4 tons across farms. Looks at the central goal of agricultural policy in the country, viz. improving and sustaining productivity, narrowing the existing productivity gaps, and enhancing resource use efficiencies to meet food requirements of a rapidly growing population. |
| Tipo: Report |
Palavras-chave: Irrigated farming; Wheat; Productivity; Performance evaluation; Water management; Cropping systems; Water supply; Soil properties; Models; Pakistan; Lower Indus Basin; Community/Rural/Urban Development; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Production Economics; Productivity Analysis. |
| Ano: 2000 |
URL: http://purl.umn.edu/53024 |
| |
|
| |
|
| |
|
| |
|
|
| Huitema, Dave; Institute for Environmental Studies (IVM), VU University Amsterdam; dave.huitema@ivm.vu.nl; Meijerink, Sander; Nijmegen School of Management, Radboud University Nijmegen; S.Meijerink@fm.ru.nl. |
| This special feature aims to further our understanding of the way in which transitions occur in water management. We contend that if we want to understand such transitions, we need to understand policy change and its opposite, policy stability. These issues have attracted considerable academic attention. Our interest is, however, very specific and thereby unique: we review the role that (groups of) individuals play in the process of preparing, instigating, and implementing policy change. In this article, a review of the literature on policy change provides the basis from which we extract a set of strategies which are available to policy entrepreneurs. The questions for the rest of this special feature are first, can we detect the influence of policy... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Case studies; Policy change; Policy entrepreneurs; Transition management; Water management. |
| Ano: 2010 |
|
| |
|
|
| MEDEIROS, J. da C.; COSTA, M. M. M. N.; PEREIRA, J. R.; SABOYA, R. de C. C.; SANTIAGO, F. dos S.; BLACKBURN, R. M.. |
| O solo é considerado elemento básico no que diz respeito a qualquer atividade agropecuária, sendo imprescindível o emprego de técnicas visando à melhoria de sua fertilidade e conservação de forma a torná-lo cada vez mais produtivo com sustentabilidade. Nos ambientes semiáridos, os solos tendem a ser mais susceptíveis a erosão, e o uso de práticas de manejo inadequadas, como queimadas, preparo do solo com grade aradora e plantio morro abaixo, vem piorando a situação. Uma das alternativas para sanar esse processo é o uso de sistemas agroecológicos, os quais buscam imitar os ecossistemas naturais, comumente considerados sustentáveis (Figura 1). No entanto, alguns aspectos em relação a manejo de água e solo carecem de informações. Para isso, elaborou-se esta... |
| Tipo: Folhetos |
Palavras-chave: ODS; Algodão; Manejo do Solo; Conservação da Água; Conservação do Solo; Controle da Erosão; Produção Orgânica; Fertilidade do Solo; Desenvolvimento Sustentável; Cotton; Soil management; Water management; Agricultural conservation practice; Erosion control; Organic production; Arid soils; Sustainable development. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148733 |
| |
|
| |
|
|
| Ohashi,Augusto Yukitaka Pessinatti; Pires,Regina Célia de Matos; Ribeiro,Rafael Vasconcelos; Silva,André Luiz Barros de Oliveira. |
| Despite of the agronomic importance for water management, few studies of sugarcane roots have been performed under field conditions during the crop cycle. The aim of this study was to determine the cumulative root density (LA), root distribution on soil profile and the effective rooting depth (ERD) for three sugarcane cultivars using the minirhizotron method. A field experiment was done with sugarcane cultivars IACSP94-2094, IACSP94-2101 and SP79-1011 grown under subsurface drip fertigation. Soil chemical and physical characteristics were also evaluated. Root evaluations were taken at 38, 58, 123, 185 and 205 days during the second ratoon, considering the soil profile until 0.8 m depth. The highest LA and root growth rates were found up to 0.4 m soil layer... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum spp.; Irrigation; Water management; Effective rooting depth; Root growth rate. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000200131 |
| |
|
|
| Silva,Bruno Bonemberger da; Mercante,Erivelto; Boas,Marcio Antonio Vilas; Wrublack,Suzana Costa; Oldoni,Lucas Volochen. |
| ABSTRACT Estimation of evapotranspiration is a key factor to achieve sustainable water management in irrigated agriculture because it represents water use of crops. Satellite-based estimations provide advantages compared to direct methods as lysimeters especially when the objective is to calculate evapotranspiration at a regional scale. The present study aimed to estimate the actual evapotranspiration (ET) at a regional scale, using Landsat 8 - OLI/TIRS images and complementary data collected from a weather station. SEBAL model was used in South-West Paraná, region composed of irrigated and dry agricultural areas, native vegetation and urban areas. Five Landsat 8 images, row 223 and path 78, DOY 336/2013, 19/2014, 35/2014, 131/2014 and 195/2014 were used,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water management; Land cover; Energy balance. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200221 |
| |
|
| |
|
|
| Cutts, Bethany B. ; School of Life Sciences, Arizona State University; Decision Center for a Desert City, Arizona State University; bcutts@asu.edu; Larson, Elisabeth K. ; School of Life Sciences, Arizona State University; eklarson@asu.edu; Darby, Kate J.; School of Human Evolution and Social Change, Arizona State University; Kate.Darby@asu.edu; Neff, Mark; Consortium for Science, Policy and Outcomes, Arizona State University ; Mark.Neff@asu.edu; Wutich, Amber; School of Human Evolution and Social Change, Arizona State University; Amber.Wutich@asu.edu; Bolin, Bob; School of Human Evolution and Social Change, Arizona State University; Bob.Bolin@asu.edu. |
| The need to develop successful collaborative strategies is an enduring problem in sustainable resource management. Our goal is to evaluate the relationship between information networks and conflict in the context of collaborative groundwater management in the rapidly growing central highland region of Arizona. In this region, water-management conflicts have emerged because of stakeholders’ differing geographic perspectives and competing scientific claims. Using social network analyses, we explored the extent to which the Verde River Basin Partnership (VRBP), which was charged with developing and sharing scientific information, has contributed to collaboration in the region. To accomplish this, we examined the role that this stakeholder... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Arizona; Boundary spanning; Collaborative management; Environmental governance; Information networks; Power; Water management. |
| Ano: 2010 |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Flumignan,Danilton L.; Faria,Rogério T. de; Lena,Bruno P.. |
| Quantifying soil evaporation is required on studies of soil water balance and applications aiming to improve water use efficiency by crops. The performance of a microlysimeter (ML) to measure soil evaporation under irrigation and non-irrigation was evaluated. The MLs were constructed using PVC tubes, with dimensions of 100 mm inner diameter, 150 mm depth and 2.5 mm wall thickness. Four MLs were uniformly distributed on the soil surface of two weighing lysimeters conducted under bare soil, previously installed at Iapar, in Londrina, PR, Brazil. The lysimeters had 1.4 m width, 1.9 m length and 1.3 m depth and were conducted with and without irrigation. Evaporation measurements by MLs (E ML) were compared with measurements by lysimeters (E L) during four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water management; Water balance; Lysimeters; Soil water. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100009 |
| |
|
| |
| Registros recuperados: 158 | |
|
|
|
